Machine for making coils of wire



April 27, 1937. c. EISLER MACHINE FOR MAKING COILS OF WIRE Filed March 1, 1935 5 Sheets-Sheet l INVENTOR April 27, 1937. c. EISLER MACHINE FOR MAKING COILS OF WIRE Filed March 1, 1935 5 SheetsSheet 2 mm NR INVENTOR m April 27, 1937. c s E 2,078,630

MACHINE FOR MAKING COIL S OF WIRE Filed March 1, 1935 5 Sheets-Sheet 3 INVENTOR ATTNEY April 27, 1937.

' c EISLER 2,078,630

MACHINE FOR MAKING COIL-S OF WIRE Filed March 1, '1935 5 Sheets-Sheet 4 E} 5 Q i i k iiiiiij JINVENTOR C. EISLER A ril 27, 1937.

MACHINE FOR MAKING COILS OF WIRE Filed March 1; 1935 5 Sheets-Sheet 5 INVENTOR M BY ATTOR Y w 4 a fi I .2 f MMIHHHI II IH HI LI IH HM IHH I MI I HI I I HI IHH IN\ 4 I |||||1||||||l||| Patented Apr. 27, 1937 UNITED STATES PATENT OFFICE 2 Claims.

This invention relates to an improved machine for making coils of wire in which coils it is essential that a uniformity in pitch and evenness in looping is maintained. The particular form of article to be produced is a filament for radio tubes but other articles of like nature can be manufactured on the machine in which case obvious changes of sizes and proportions of parts would be made.

The machine described and illustrated in this specification is a compact unit which has the advantage of speed in the manufacture of the wire coil, the filament being usually wound, at the rate of 10,000 E. P. M. although this speed is not essential to successful operation. The machine is economical in operation and is designed to deliver filament wound on a soft metal core which filament coil and core is cut into suitable lengths and then the core is removed by acid or other medium. The cutting of the strand or filament and removal of the core is done subse quent to the operation of the machine and forms no part of this invention.

The invention further resides in certain details of construction which will be more fully described hereinafter and finally embodied in the claims.

The machine which is the subject matter of this application is illustrated in the accompanying drawings. In said drawings, Figure 1 is a plan view of the machine. Figure 2 is a vertical longitudinal section on Figure 1 with the motor removed. Figure 3 is a detail top view of a guide for the finished product of the machine. Figure 4 is a side view of the parts shown in Figure 3. Figure 5 is a view looking at the machine from the front.

Figure 6 is a similar view of the motor and the winding fixture, the latter being shown in section. Figure 7 is a section on line 'I'I in Figure 1. Figure 8 is a detail front View, enlarged, of the winding fixture. Figure 9 is a View of the machine looking at it from the rear. Figure 10 is a section on line I0I0 in Figure 1. Figure 11 is a diagrammatic perspective of the winding step with an electric circuit indicated, which circuit isv applied in the case of winding hard wire. Figure 12 is a longitudinal horizontal section through the base of the machine. Figure 13 is a view of the core and coil being wound thereon. Figure 14 is a side view of the product of the machine indicating how it is transversely severed. Figure 15 is a side view of a severed piece showing it in a partly finished filament for a radio tube. Figure 16 is an end view and Figure 17 is a section of the piece shown in Figure 15. Figure 18 is a section and Figure 19 is an end view of the finished filament, the core having been removed, which removal is usually accomplished with acid. 5

The machine is preferably made to accommodate the driving mechanism in a closed space in order to allow it to run in oil. The casing I0 is the closed base having the oil chamber II and the top I2. The top serves as the platform on which the coil forming mechanism is mounted which mechanism includes the electric motor I3. The motor acts to perform the coiling operations and also acts to drive all the associated parts which cause the core and coil to proceed through the machine.

In the case of wire coils the coil is treated electrically for heating. This necessitates the insulation of all parts of the coil feeding and progressing mechanism. For this reason the various parts are insulated from the casing.

The motor I3 has a hollow shaft I4 through the bore of which the core I5 passes. The hollow shaft also serves as a support for the coiling fixture I6 which feeds and wraps the wire or other strand around the core as it is fixed to the shaft and rotates with it whereas the core does not rotate but passes freely in a longitudinal direction through the shaft.

The core I5 is supplied from a spool I! which is replaceable on a shaft I8 (see Figure 10) and has a friction brake I9 to hold the spool under proper tension sufiicient to keep the core taut but not under excessive tension. The shaft I8 is supported by the standard 20 which rests on the sheet of insulation 2|. The spool is confined by a plate 22, readily removable, the illustration showing the key hole slots 23 fitting over the headed studs 24. The spool is arranged transversely on the rear end of the machine for compactness and the core passes over the pulley 25 which is supported on the post 26 and is insulated as at 27. The core passes through the hollow shaft of the motor and is supplied with a coil of Wire or other form of strand such as insulation cord as it emerges from the shaft. On the shaft I4 is the coiling fixture I6 held in place by suitable means, such as the screws 28. (See Figure 8.) The fixture also includes a spool of wire 29. The fixture also has two guide rollers 30 and 3| over which the wire 32 passes from the spool 29 and is then passed around the core I5. The core is held against excess vibration by a post 33 which extends from a foot 34 on the fixture I6. The post 33 also acts to follow around on the coil as it is formed on the core. It will be evident that as the core advances through the operation of mechanism to be hereinafter described it is timed 'to receive the wire 32 which forms a close coil around the core. The wire 32 is very small and is at all times supported close to the core and is wound on the core at a high speed which is the speed of the motor shaft. No intermediate gears are required and the capacity of the machine is much greater compared to Winding by intermediate slowing of the speed of the wire.

The wire as thus wound on the core is passed around a pulley 35 on the post 36 andinsulated therefrom as at 31. The encased core I5 then passes around a drum 38. It is preferably passed around the drum several times to equalize the tension and for this repetition of winding the sheave 39, with multiple grooves, is mounted on r a standard 40 and is insulated as at 4!. The drum 38 is insulated at 42 from its support 43. The coiled ,or covered core l5 is then wound on a spool 44 which is positively driven. The fingers 45 on a rod 46 are moved up and down at proper speed for the spooling of the coiled core These associated parts are all driven in proper time from the motor. The chamber ll contains the main shaft 47 which is driven from the motor by suitable gearing. The illustration shows a pinion 48 on the motor shaft I4 which is meshed with a gear 09 on a vertical shaft 50. The gears as and 49 are in a housing 5|. The shaft 50 has a gear 52 inside the chamber II which is in mesh with a gear 53 on the main shaft 41. The shaft 4'! drives the spool 44 by the gear 54 on the shaft 47 and the gear 55 on the shaft 56 which supports the spool 44. The spool is removable and the key hole slots 5'! and the headed studs 58 form one convenient means for such removable support.

The shaft 41 also drives the drum 38 by means of gears 59 and 60 which operate the shaft 6| on which the drum 38 and gear 59 are mounted.

The rod 46 is moved vertically by the cam 62 rotating on a standard 63 and driven by gear 84 which is in mesh with the pinion 66 which rests on the cam 62. The guide bar 61 prevents the turning of the rod 46. Suitable insulation 68 separates the rod 46 from electrical contact with the machine as does the insulating sleeve 69.

In order to inspect the minute coils to check the uniformity of the coils the magnifying glass 70 is mounted so as to oscillate on the standard ii and is located at a point to permit inspection of the coils before and after they pass the pulley 35 as will be seen from the dotted lines showing in Figure 1.

In case the small wire 32 requires heating for its smooth coiling on the core it is subjected to an electrical current of proper voltage which passes at one point through this small wire as it is coiled and thereby affects pliability to an extent to prevent breakage and insure an even coil. The current is applied by a connection 12 from the wire 73. The connection is insulated from the post 36 but is in contact with the pin 31 which is in the insulated sleeve 14 and thus to the pulley 35. The pulley conveys the current to the coil l5 and thus to small strand 32 which, being of small gage, is readily heated. The current passes then to the motor casing through the coiling fixture and is thus grounded on the case H). The other terminal 15 and wire 16 leads to the same source of power as the wire 13. This hook-up treats the coil l5 and small wire 32 between the pulley 35 and the spool 29 with the electrical current of sufficent voltage to properly condition the small wire for its relatively close coiling.

In operating the machine all that needs be done is to thread the core through the hollow shaft of the motor and guide it around the pulley 35 to its winding mechanism. The spool 29 of small wire or other strand is placed on the coiling fixture i6 and initially coiled around the core.

' The motor I3 is then started and the coiling continues at a high rate of speed until the spool 29 is exhausted, when it is replaced by another.

The coil I5 is then cut into suitable lengths as in Figure 14 to form the short lengths as in Figure 15 and then by a well-known acid treatment the soft core I5 is removed and the filament shown'in Figure 19 is the finished product ready for use in the manufacture of radio tubes. Of course other articles .of similar construction may be made on the machine.

The machine also embodies a means for varying the speed of the core to determine the pitch of the filament coil by means of the drum 38.

The drum 38 is readily removable from the shaft 61 on which it is mounted. The drum can thereby be easily removed and. another drum of different size substituted. This drum 38 determines, by its size, the pitch of the coil I5=-, as the speed of the drum is constant. The larger the drum the coarser the pitch of the coil as the speed of the core is faster. A finer pitch is secured by using a smaller drum 38. replacement of the drums 3B is an improvement over the prior machines which required a change of gearing when a coil of different pitch was desired. The pitch of the coil is determined by the size of the drum 38. V

The coil made on this machine can be used for various purposes but the machine as illustrated is particularly designed for filaments used in radio tubes and electric lamps.

The machine is a marked improvement due to the increase of speed possible. Machines heretofore have been run at a speed to provide coils at the rate of one to three thousand R. P. M. whereas in this machine the filaments can be wound at the rate of 10,000 R. P. M. Furthermore there is about 70% less horse power required than in a machine of the same size of the old type.

Various changes in the form and proportion of parts may be made without departing from the scope of this invention.

I claim:- 7

1. A machine for making coils of wire comprising means for supporting a core, means for coiling wire around the core, and drums, readily replaceable, said drums being of different diameters whereby the speed of the core may be varied, the drums being operated as a take-up means for the product whereby the size of the drum controls the pitch of the coil. 7

2. A machine for making coils of wire comprising means for feeding a core, means for coiling a wire on the core as the core advances, a drum for taking up the wound coil, and means for detachably securing the drum, whereby various sizes of drum can be installed to control the pitch of the coil by the speed at which the coil is taken up.

CHARLES EISLER.

This ready 

